A closed gas turbine in which fuel is burnt directly in the air is not possible because of__________________?

Related Mcqs:

1. The pressure ratio for an open cycle gas turbine compared to closed cycle gas turbine of same h.p. is_______________?

   A. low B. high C. same D. low/high depending on make and type E. unpredictable...

2. It is not possible to use closed gas turbine cycle in aeronautical engines because_________________ ?

   A. it is inefficient B. it is bulky C. it requires cooling water for its operation D. non of theses...

3. In jet engines, for the efficient production of large power, fuel is burnt in an atmosphere of__________________?

   A. vacuum B. atmospheric air C. compressed air D. oxygen alone E. liquid hydrogen...

4. The thermal efficiency of a simple gas turbine for a given turbine inlet temperature with increase in pressure ratio_____________________?

   A. increases B. decreases C. first increases and then decreases D. first decreases and then increases E. remains same...

5. There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would__________________?

   A. remain same B. decrease C. increase D. unpredictable E. none of the above...

6. As the turbine inlet temperature increases, the thermal efficiency of gas turbine for the optimum pressure ratio_____________________?

   A. increases B. decreases C. remains same D. first increases and then decreases E. first decreases and then increases...

7. If infinite number of heaters be used in a gas turbine, then expansion process in turbine approaches _________________?

   A. isothermal B. isentropic C. adiabatic D. isochoric E. isobaric...

8. The weight per horse power ratio for gas. turbine as compared to I.C. engine and steam turbine is________________?

   A. same B. higher C. lower D. uncomparable E. unpredictable...

9. The work ratio of a gas turbine plant is defined as the ratio of__________________?

   A. net work output and heat supplied (6) net work output and work done by tur¬bine C. actual heat drop and isentropic heat drop D. net work output and isentropic heat drop E. isentropic increase/drop in tempera¬ture and actual increase/ drop in temperature...

10. Air-fuel ratio in a jet engine will be of the order of__________________?

    A. 10: 1 B. 15: 1 C. 20 : 1 D. 60 : 1 E. 100 :...